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Water drainage gas recovery system and method based on underground jet drainage and wellhead compression

A technology for drainage and gas production and compressors, which is applied in wellbore/well valve devices, wellbore/well components, and production fluids, etc., can solve the problems of high cost, complex process, large investment, etc., and saves investment and management. The effect of maintenance costs

Pending Publication Date: 2021-02-09
XIAN ZHONGHAI PETROLEUM TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention provides a drainage and gas production system based on downhole jet drainage and wellhead compression, which solves the problems of large investment and high cost caused by the existing way of laying in the same ditch to inject gas into the gas well, and the need to lift out the existing downhole pipe string structure. Process complications caused by tubing strings connected to gas lift valves or jet pumps

Method used

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  • Water drainage gas recovery system and method based on underground jet drainage and wellhead compression
  • Water drainage gas recovery system and method based on underground jet drainage and wellhead compression
  • Water drainage gas recovery system and method based on underground jet drainage and wellhead compression

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Effect test

Embodiment 1

[0037] Drainage and gas recovery systems based on downhole jet drainage and wellhead compression, such as figure 1 As shown, it includes one end connected to the wellhead gas production system, the other end connected to the continuous gas lift system in the wellbore casing, and the jet diverter 16 arranged at the pipe hole in the wellbore tubing;

[0038] The wellhead gas production system includes the main control gate valve 1 and the test gate valve 2 connected to the wellhead gas production tree through flanges. The lower part and the upper part of the main control gate valve 1 are respectively connected to the first needle valve through the first casing gate valve 3 and the production gate valve 4. 5. The first needle valve 5 is sequentially connected to the external gas gathering station through the electromagnetic shut-off valve 6 and the first flow meter 7; the main control gate valve 1, the test gate valve 2, the first casing gate valve 3, and the production gate valve...

Embodiment 2

[0051] The gas recovery method of the drainage gas recovery system based on downhole jet drainage and wellhead compression, including two stages of well opening and continuous gas recovery;

[0052] The steps in the well opening phase are as follows:

[0053] A1. The controller controls the main control gate valve 1, the production gate valve 4, the electromagnetic shut-off valve 6, the first flow meter 7, the second bushing gate valve 14 normally open, the second end and the third end of the first three-way valve 8, the second The first end and the second end of the two-way valve 10 are opened, and the compressor 13 is controlled to start; the low-pressure gas in the external pipeline is introduced into the compressor 13;

[0054] A2. The gas enters the wellbore casing after being compressed by the compressor 13, and enters the jet diverter 16 to pressurize along the tubing hole and the air intake hole 164, lifts the downhole gas and liquid to the wellhead gas production syst...

Embodiment 3

[0061] Such as figure 1 As shown, the drainage gas recovery system based on downhole jet drainage and wellhead compression also includes a combustion tank 18 connected to the gas-liquid separator 9; the combustion tank 18 is used to introduce natural gas in the system for combustion when the system stops gas lift.

[0062] The beneficial effect of this embodiment is: the setting of the combustion tank ensures the safety of the continuous gas lift drainage gas recovery system, and facilitates the combustion of natural gas in the system when the gas lift is stopped, preventing it from leaking into the environment and causing environmental pollution .

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Abstract

The invention relates to the technical field of natural gas field exploitation, and discloses a water drainage gas recovery system and method based on underground jet drainage and wellhead compression. The system comprises a continuous gas lift system with one end connected with a wellhead gas recovery system and the other end connected with the interior of a wellbore casing, and an jet drainage device arranged at a control part in an oil pipe of a wellbore. When a well is opened, the continuous gas lift system can reversely transmit low-pressure gas in an external transmission pipeline into acompressor, the low-pressure gas is compressed into high-pressure gas by the compressor and then injected into the wellbore casing, underground liquid and gas are lifted to the ground after being pressurized by the jet drainage device, and lifted gas-liquid mixture is separated into pure liquid and pure gas by a gas-liquid separator; and during continuous gas production, one part of the pure gasis conveyed outwards, the other part of the pure gas is continuously conveyed into the compressor to be compressed and then injected into the wellbore casing, the underground liquid and gas are liftedto the ground after being pressurized by the jet drainage device, and continuous gas production is achieved through circulation.

Description

technical field [0001] The invention relates to the technical field of natural gas field exploitation, in particular to a drainage and gas recovery system and method based on downhole jet drainage and wellhead compression. Background technique [0002] At present, the main method of continuous gas lift for water-producing gas wells in major domestic large fields is to lay gas injection pipelines and production pipelines in the same ditch between the wellhead and the gas gathering station, and the compressor of the gas gathering station injects high-pressure gas into the well through the gas injection pipeline. When the high-pressure gas pressure is greater than the sum of the production pipeline pressure and the pressure generated by the height of the liquid column in the well, due to the "U"-shaped tube principle, the liquid column in the well and the gas above the liquid column are lifted to the production pipeline to the gas gathering station. In such a cycle, the fluid c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/00E21B34/02E21B43/34E21B47/00
CPCE21B43/124E21B43/123E21B34/02E21B43/34E21B47/00
Inventor 李小峰王宏斌
Owner XIAN ZHONGHAI PETROLEUM TECH CO LTD
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